[F:1][C:2]([F:15])([F:14])[S:3]([O:6]S(C(F)(F)F)(=O)=O)(=[O:5])=[O:4].O[CH2:17][CH:18]1[CH2:22][O:21][C:20](=[O:23])[CH2:19]1.N1C(C)=CC=CC=1C>C(Cl)Cl>[F:1][C:2]([F:15])([F:14])[S:3]([O:6][CH2:17][CH:18]1[CH2:19][C:20](=[O:23])[O:21][CH2:22]1)(=[O:5])=[O:4]A solution of trifluoromethanesulfonic anhydride (15.0 g, 53.2 mmol) in DCM (25 mL) was added dropwise to a solution of 4-(hydroxymethyl)dihydrofuran-2(3H)-one (4.75 g, 41.0 mmol) and 2,6-lutidine (7.15 mL, 61.4 mmol) in DCM (111 mL) at 0° C. The mixture was stirred at 0° C. for 20 minutes. The product mixture was diluted with DCM (100 mL) and was washed with water (3×100 mL). The organic phase was dried over magnesium sulfate and evaporated under vacuum.
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